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<dc:title xml:lang="en">Non-ideality of mixing in phospholipid bilayer system : molecular dynamics view</dc:title>
<dcterms:alternative xml:lang="fr">Mélanges non-idéaux dans les bicouches phospholipidiques : approche dynamique moléculaire</dcterms:alternative>
<dc:subject xml:lang="fr">Bicouches lipidiques</dc:subject>
<dc:subject xml:lang="fr">Membranes</dc:subject>
<dc:subject xml:lang="fr">Facteur de structure</dc:subject>
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<dc:subject xml:lang="fr">Théorie de Kirkwood-Buff</dc:subject>
<dc:subject xml:lang="fr">Mélanges lipidiques</dc:subject>
<dc:subject xml:lang="fr">Théorie des solutions régulières</dc:subject>
<dc:subject xml:lang="fr">Simulations numériques</dc:subject>
<dc:subject xml:lang="fr">SPICA</dc:subject>
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<dc:subject xml:lang="en">Lipid bilayers</dc:subject>
<dc:subject xml:lang="en">Membranes</dc:subject>
<dc:subject xml:lang="en">Structure factor</dc:subject>
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<dc:subject xml:lang="en">Kirkwood-Buff theory</dc:subject>
<dc:subject xml:lang="en">Lipid mixtures</dc:subject>
<dc:subject xml:lang="en">Theory of regular solutions</dc:subject>
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<tef:elementdEntree autoriteExterne="027507033" autoriteSource="Sudoc">Membranes lipidiques</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027867048" autoriteSource="Sudoc">Phospholipides</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027823008" autoriteSource="Sudoc">Dynamique moléculaire</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les phospholipides sont des molécules amphiphiles qui s'auto-assemblent en bicouches dans l'eau et présentent des propriétés physiques et chimiques complexes et diverses en fonction de leur composition. Le rôle des lipides dans les membranes cellulaires est essentiel. La dynamique moléculaire permet d'étudier les structures des bicouches à des échelles nanométriques et picosecondes, qui sont soit difficiles soit impossibles à atteindre expérimentalement. Nous nous concentrons ici sur les propriétés thermodynamiques des mélanges lipidiques purs et binaires, en utilisant le champ de force lipidique à gros grains SPICA. En adaptant la théorie des solutions de Kirkwood-Buff à notre cas, nous analysons les fluctuations de densité dans l'espace réciproque (facteurs de structure) pour obtenir les paramètres thermodynamiques d'intérêt, tels que la compressibilité ou l'énergie libre de mélange dans une théorie de description régulière des solutions. Nous montrons ensuite comment relier en pratique les propriétés moléculaires des modèles lipidiques à gros grains aux propriétés thermodynamiques collectives du système macroscopique correspondant.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Phospholipids are amphiphilic molecules that self-assemble into bilayers in water, and display complex and diverse physical and chemical properties depending on the composition. The role of lipids in cell membranes is essential. Molecular dynamics allows to investigate bilayer structures at nanometric and picosecond scales, that are either challenging or impossible to reach experimentally. We focus here on the thermodynamical properties of pure and binary lipid mixtures, using the SPICA coarse-grained lipid force field. Adapting the Kirkwood-Buff theory of solutions to our case, we analyse the density fluctuations in reciprocal space (structure factors) to obtain the thermodynamic parameters of interest, such as the compressibility or the free-energy of mixing in a theory of regular solution description. We then show how to relate in practice the molecular properties of coarse-grained lipid models to the collective thermodynamical properties of the corresponding macroscopic system.</dcterms:abstract>
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